1. A Survey of Extent and Cost of Weed Control and Specific Weed Problems;Agric. Res. Serv.,1965
2. Plant Pests of Importance to North American Agriculture;Agric. Res. Serv. USDA,1966
3. Economic impact of crop losses;Ahrens,1981
4. Weed-Crop Ecology: Principles in Weed Management;Aldrich,1984
5. Principles in Weed Management;Aldrich,1997